If you want the best results straight off then I wouldn't question the development and testing that went into the Ivan's kit or the experience that Mike (Falcon 269) has in fitting them.
If you're happy to keep taking the carbs on and off so you can prove to yourself the benefits of each modification as a learning experience then fair enough.
If you're happy to keep taking the carbs on and off so you can prove to yourself the benefits of each modification as a learning experience then fair enough.